Where can I find a hole/plug to run a power cable from the firewall?

Also, got 4 12" Rockford PII subs
At the moment got twin 12" boxes for them
But at a later stage will fibreglass them into the boot

What is the best positioning in a 97 Verada?
Both once fibreglassed and at the moment with the boxes?

http://www.aussiemagna.com/forums/showthread.php?t=24057&page=2

Make sure you fuse near the battery and ensure the wire doesnt scrape the firewall.

Unplug the negative terminal when working on the electrics.

Thanks for that, much appreciated :)